package com.core;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

/*
* 
* ɸѡ������������
* ��web.xml��������Ϣ
*/
public class SetCharacterEncodingFilter implements Filter {
     protected String encoding = null;
     protected FilterConfig filterConfig = null;
     protected boolean ignore = true;
     PrintWriter toClientTextOutStream;
     
     // ���
     public void destroy() {
         this.encoding = null;
         this.filterConfig = null;
     }
     // ִ�й���
     public void doFilter(ServletRequest request, ServletResponse response,
                          FilterChain chain) throws IOException, ServletException {
    	 
         // Conditionally select and set the character encoding to be used
         if (ignore || (request.getCharacterEncoding() == null)) {
             String encoding = selectEncoding(request);

             if (encoding != null)
                 request.setCharacterEncoding(encoding);
             
             HttpServletRequest hsr = (HttpServletRequest)request;
             if(hsr.getServletPath().contains("manualGenPaper")) {
            	 request.setCharacterEncoding("UTF-8");
             }
            	 
         }
         
         chain.doFilter(request, response);
         
     }

     public void init(FilterConfig filterConfig) throws ServletException {
    	 
    	 System.out.println("***FEEDBACK SetCharacterEncodingFilter init***");
         this.filterConfig = filterConfig;
         this.encoding = filterConfig.getInitParameter("encoding");
         String value = filterConfig.getInitParameter("ignore");
         if (value == null)
             this.ignore = true;
         else if (value.equalsIgnoreCase("true"))
             this.ignore = true;
         else if (value.equalsIgnoreCase("yes"))
             this.ignore = true;
         else
             this.ignore = false;
     }

     protected String selectEncoding(ServletRequest request) {
         return (this.encoding);
     }
}